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  2. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    3.78 cm – amount of distance the Moon moves away from Earth each year [114] 4.3 cm – minimum diameter of a golf ball [115] 5 cm – usual diameter of a chicken egg; 5 cm – height of a hummingbird, the smallest-known bird; 5.08 cm – 2 inches, 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube; 6.1 cm – average height of an apple

  3. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Example (metric fine): For M7.0×0.5, major minus pitch yields 6.5, which at 92.9% happens to be an example that pushes over the outer bound of the 90% ± 2 pp, but major minus pitch is still valid, although smaller drills (6.3 mm, 1 ⁄ 4, 6.4 mm) will work well.

  4. Miner's inch - Wikipedia

    en.wikipedia.org/wiki/Miner's_inch

    The miner’s inch measures the amount of water that would flow through a slot of a given area at a given pressure (for example, at a head of 6 inches of water, or 1.5 kPa.) In miner's inch the word inch refers to the area of the slot in square inches, while the pressure in inches of water refers to the height of water above the slot. A ...

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  6. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

  7. League (unit) - Wikipedia

    en.wikipedia.org/wiki/League_(unit)

    However, the accepted number of Spanish nautical leagues to a degree varied between 14 1/6 to 16 2/3, so in actual practice the length of a Spanish nautical league was 25,733 feet (4.235 modern nautical miles) to 21,874 feet (3.600 modern nautical miles) respectively.

  8. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    Most modern lenses use a standard f-stop scale, which is an approximately geometric sequence of numbers that corresponds to the sequence of the powers of the square root of 2: f /1, f /1.4, f /2, f /2.8, f /4, f /5.6, f /8, f /11, f /16, f /22, f /32, f /45, f /64, f /90, f /128, etc. Each element in the sequence is one stop lower than the ...

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